#include <stdio.h>
#include <stdlib.h>
#include <math.h>	/* for log10 and pow */

void printd(int n);

int main()
{
	printd(12345);
	printf("\n");
	return EXIT_SUCCESS;
}

/* Print a non-negative int in decimal. */

#if 0
void printd(int n)
{
	int i;

	for (i = pow(10, (int)log10(n)); i >= 1; i /= 10) {
		printf("%d", n / i % 10);
	}
}
#endif

void printd(int n)
{
	/* If n has any digits in addition to the rightmost digit, */
	if (n >= 10) {
		printd(n / 10);     /* Print all but the rightmost digit of n. */
	}

	printf("%d", n % 10);   /* Print the rightmost digit of n. */
}